I'm still cogitating, because before doing anything, it's better to be sure of having an interesting lead. Experimentation is for later. First idea: Transposing the principle to the electrical rather than the magnetic domain would considerably reduce losses, since we no longer have those due to the Joule effect of induced currents. A dielectric cylinder or disk rotating between the plates of a capacitor in a tuned circuit should be able to increase the signal. The problem is to get the working frequency low enough to be of the order of the speed of rotation. Second idea: It follows maxmalone's above reference to Faraday's disk. The general principle of the Faraday disc is a constant magnetic field passing through a circuit made up of two half-circuits, one of which is movable relative to the other. This creates the conditions for the charges in each half-circuit to influence each other, creating a current in the circuit. The problem is that the necessary sliding contacts between the two half-circuits are difficult to achieve without significant losses, and the low voltage limits cannot be overcome without putting several disks in series, so with additional sliding contacts and losses, nothing is gained. Here, the principle is different but we note that the currents in the rotating cylinder that creates the relative speed of the charges with the fixed part, necessary to obtain a current as in the case of the Faraday disk, do not require any sliding contact, nevertheless we can exploit the currents of this “moving circuit”. Could we increase voltage now by multiplying the number of moving parts, like cylinders? And then I'd find a serious family resemblance with Searl's generator, so there could be a solid theoretical basis for Searl's generator which has yet no proven explanation: 
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Topic: Amplification of an EM wave by mechanical rotation, the Zaldovich effect (Read 2836 times)
